220400177 has 2 divisors, whose sum is σ = 220400178. Its totient is φ = 220400176.

The previous prime is 220400161. The next prime is 220400227. The reversal of 220400177 is 771004022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150577441 + 69822736 = 12271^2 + 8356^2 .

It is a cyclic number.

It is not a de Polignac number, because 220400177 - 2⁴ = 220400161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220400107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110200088 + 110200089.

It is an arithmetic number, because the mean of its divisors is an integer number (110200089).

Almost surely, 2^220400177 is an apocalyptic number.

It is an amenable number.

220400177 is a deficient number, since it is larger than the sum of its proper divisors (1).

220400177 is an equidigital number, since it uses as much as digits as its factorization.

220400177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 220400177 is about 14845.8808091672. The cubic root of 220400177 is about 604.0468811834.

Adding to 220400177 its reverse (771004022), we get a palindrome (991404199).

The spelling of 220400177 in words is "two hundred twenty million, four hundred thousand, one hundred seventy-seven".